<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <button @click="cartoon = !cartoon">改变动漫</button>
    <h1>今天是喜欢{{cartoon?"海贼":"火影"}}</h1>
    <img :src="url" alt="">
  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data() {
        return {
          cartoon: true,
          url: "./01.webp"
        }
      },
      watch: {
        cartoon: {
          handler(newValue, oldValue) {
            this.url = newValue ? "./01.webp" : "./02.webp"
          }
        }
      }
    })
  </script>
</body>

</html>